From: Jayce Meade <azimuth-rubytalk@...>
Date: 2009-02-24T05:39:29+09:00
Subject: Thread Deadlock on Ruby 1.8.7

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Hey everyone.

   I'm running into a bit of a problem, what I'm trying to do is =
basically use one ruby script to initiate the main program, so that when =
I want to restart the program, it literally exits, going all the way =
back to the starter script so that all the files loaded by the main =
script are loaded anew when the starter script runs the program again.

  I have achieved this by using system(), but it started two ruby =
processes so I tried using Thread.new{} instead since all thread =
variables are local to that thread, thus all my files and variables are =
unassigned when the thread terminates. It runs wonderfully, but when I =
call the quit command, I get a deadlock error from the main program's =
quit method. Here's the terminal output from basic start to error:

[System] Welcome to Ecko!
[System] Loading configuration...
[12:24:10 PM][System] Configuration loaded. Running integrity checks...
[12:24:10 PM][System] System data is stable. Displaying info...
[12:24:10 PM][System] Please read the release notes for important =
information.
[12:24:10 PM][System] Starting Ecko 0.3.83 Beta RC2.
[12:24:10 PM][Connection] Checking for stored authtoken.
[12:24:10 PM][Connection] Found stored authtoken.
[12:24:10 PM][Connection] Logged in as v-Ecko-v
[12:24:10 PM][Connection] Joining default chatrooms: Botdom
[12:24:10 PM][Connection] Joined #Botdom [ok]
[12:24:39 PM][Botdom] ** AzimuthDragon has joined.
[12:24:41 PM][Botdom] <AzimuthDragon> |]quit
deadlock 0x294c1fc: sleep:J(0x2e6e07c) (main) - Ecko.rb:32
deadlock 0x2e6e07c: sleep:-  - C:/Documents and Settings/User/My =
Documents/NetBe
ansProjects/Ecko Beta 2 RC2/lib/System/Core/Communication.class.rb:555
C:/Documents and Settings/User/My Documents/NetBeansProjects/Ecko Beta 2 =
RC2/lib
/System/Core/Communication.class.rb:555: Thread(0x2e6e07c): deadlock =
(fatal)
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D
Ecko has shut down. Would you like to run it again? (y/n)

This program logs into a chat room, by the way.

Here's the starting sequence: Run Ecko.bat -> Ecko.rb -> main.rb

The batch file displays the 'Run again?' messages, for when the ruby =
script itself terminates, Ecko.rb is the initation script, and main.rb =
is the program's main file. The program can be run just by using =
main.rb, but the terminal closes when the program terminates.

I'm also using this initiation script to recognize errors, before it was =
just checking the exit code. Here's the code for the initation script =
and the method that quits the main program when used:

ecko =3D Thread.new { require 'main.rb' } # < Starts the main script, =
the main script runs itself when it's loaded, so requiring it is all =
that needs to be done.
ecko.join # < I think this is being used right, it's so that the =
initiation script doesn't continue running while the thread is alive. =
This is also as far as the initation script gets.
case ecko["exitstatus"] # < Exit code is stored here manually by the =
main program, see the below code for more info.

That's all the relevant code for the initiation script, here's the main =
program's quit code:

when 'quit'
  say(c, 'Exiting....')
  @joined.each { |chan| log(chan, "\n----- Left #{chan} at =
#{Time.now.strftime("%I:%M:%S %p")} (Quit command was used) -----\n")} # =
< Logs the quit to the chatroom logs.
  self.disconnect() # < Disconnects from chatroom.
  Thread.current["exitstatus"] =3D 0 # < Sets the exitstatus for 0 since =
this is a normal exit.
  Thread.stop # < Kills the thread, if I did it right, the program dies =
when this is executed.
  true

That's the code used to close the main program, and it dies on =
Thread.stop.

What am I doing wrong?

  - Jayce


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